Saw-filing machine.



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SAW FILING MACHINE;

APPLICATION FILED DEG. 18 1903.

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Withesses PATENTED DB0. 10, 1907.

v L H. FARROW. SAW FILING MACHINE.

- APPLIOATION FILED DEOJB, 1993.

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Z0 Invenon Witnesses Httor'negs co., WASHINGTDN, n. c.

PATENTEDD EG. 10, 1907.

I. H. PARROW.

SAW FILING MACHINE. APPLIOATIONPILED DEC. 18; 1903.

3 SHEETS-SHEET 3.

THE Nomus PETERS ca, WASHINGTON, n. c.

ISAAC HOOD FARROW, OF PUEBLO, COLORADO.

SAW-FILING MACHINE Specification of Letters Patent.

Patented Dec. 10, 190;

Application filed December 18. 1903- Serial Np. 185,766-

T 0 all whom it may concern:

Be it known that I, IsAAo HOOD FARROW, a citizen of the United States, residing at Pueblo, in the county of Pueblo and State of Colorado, have invented a new and useful Saw-Filing Machine, of which the following is a specification.

This invention relates to certain improvements in saw-filing machines, and has for its object to provide an inexpensive, durable and efficient machine of this character by means of which the teeth of a saw may be accurately spaced and uniformly filed at any desired pitch or angle and to any desired de th.

ll further object of the invention is to rovide means for the roper adjustment o the file carriage and ho der and means whereby the latter may be readily adjusted to accommodate files of different lengths.-

A still further object of the invention is to provide means for securing the machine to a work bench or other suitable support and means for firmly holding the saw 1n position to be operated upon.

With these and other objects in view the invention consists in the construction and novel combination and arran 'ement of parts hereinafter fully described, 11 ustrated in the accompanying drawings and pointed out in the claims hereto appended, it being understood that various changes in form, proportions and minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of the invention.

In the accompanying drawings, forming a part of this specification,Figure 1 is a per spective view of a saw-filing machine constructed in accordance with my invention. Fig. 2 is-a transverse sectional view of the same. Fig. 3 is a top plan view of the machine showing the file carriage and holder in position to file the teeth on one side of the saw. Fig. 4 is a similar view showing the saw reversed and the file carriage and holder in position for sharpening the reverse side of the saw teeth. Fig. 5 is a detail perspective view of a portion of the saw carriage, detached. Fig. 6 is a similar view of the bench clamp and a portion of the saw-clamping members. Fig. 7 is a top plan view of the terminal portion of one of the file-holding arms, and Fig. 8 is a longitudinal sectional view of the fileholding arms showing the file in position.

Similar numerals of reference indicate coresponding parts in all the figures of the drawings.

The machine comprises a rectangular supporting frame consisting of a longitudinal bar 5, the terminal laterally-extending arms 6 of which are connected by a rod 7 and are rovided with depending spurs 8 adapted to be driven into a bench or other suitable support 9. One side of the bar 5 is rabbeted, as indicated at 10, and secured to the opposite side of said bar in any suitable manner, as by screws 1.1, is a bracket 12 designed to support the machine in position on the bench 9. The bracket 12 is provided with a pair of up- 'wardly-extending spaced arms 13 and pivoted between said arms is a clamping member 14 to the upper end of which is secured a clamping jaw 14 having its inner face rab beted to correspond to the adjacent rabbeted face of the bar 5. Detachably mounted in the longitudinal groove or recess formed by the jaw 14 and bar 5 is a pair of clamping bars 15 designed to engage the saw 16 and retain the latter in position for filing. The jaw 14 is forced into engagement with the clamping bars 15 by means of a screw 17 threaded in an opening in the long end of the ivoted member 14 and bearing against the bracket 12. It will thus be seen that by adjusting the screw 17 the clamping jaw 14 may be released so that the auxiliary bars 15, together with the saw, may be removed and replaced in reversed position to thereby permit the filing of the teeth on the opposite side of said saw.

Mounted for longitudinal travel 011' the supporting frame is a reciprocating file carriage 18 provided with a pair of depending ears or lugs 19 having alined openings 20 formed therein for the reception of the rod 7, the latter being detachably secured in suitable openings in the end pieces or arms 6 by means of set screws 21, so that the rod may be readily detached to permit the removal'of the carriage. The forward end of the car riage 18 is provided with a depending flange 22 which rests on the upper edge of the clamping jaw 14, the latter serving as a track to support the carriage and maintain the same in a horizontal position as said carriage is moved back and forth during the filing operation. The rear end of the carriage is extended laterally beyond the depending lugs 19 and provided with a transverse recess 23 in which is pivotally mounted a pawl 24 adapted to engage a series of teeth 25 in a spacing bar 26. The spacing bar 26 is mounted in alined .recesses in the end pieces or arms 6 of the supporting frame and 1s preferably provided with four sets of teeth, each set of teeth being uniformly spaced throughout the length of the bar but at different distances apart with respect to the adjacent set, so that by bringing any par ticular set into engagement with the pawl 24 the teeth on the saw will be correspondingly spaced.

In order to properly space the teeth on the reverse side of the saw each toothed edge of the bar 26 is provided with one or more terminal notches 26 for engagement with a looking pawl 26", whereby when the bar is shifted longitudinally in the alined recesses of the frame, said bar will be moved just one half the distance of the cuts made in the saw in the revious filing operation.

T16 pawl 24 is normally held in engagement with the teeth 25 on the spacing bar by means of a spring 27 interposed between the lateral extension of the carriage and the handle 28 of said pawl, whereby the file carriage is moved longitudinally of. the frame with a step-by-step movement. Mounted on the carriage 18 is a circular plate or disk 29 and superposed on said plate is a similar plate 30 rovided with a radiating arm 31 carrying t 1e file-holding frame. The disk or plate 29 is held in fixed relation with respect to the top of the file carriage by means of a bolt 32, the squared shank 33 of which engages a longitudinal slot 3 1 in said carriage, while the reduced squared portion 35 of the bolt engages a corresponding recess in said plate, as clearly shown in Fig. 2 of the drawing. The plate 30 is provided with a series of graduations 31 indicatin degrees and fractions thereof, while the p lat e 29 is provided with an indicating arrow adapted to register with said graduations, whereby the angle or inclination of the file with respect to the saw may be accuratelydetermined. The arm 31 carrying the file-holding frame is clamped in adjusted position by means of a wing nut 37 engaging the terminal threads of the bolt 32, and said arm, together with the plates 29 and 30, may be adjusted transversely of the file carriage in order to shift the relative position of the file-holding frame by releasing the nut 37 and moving the bolt laterally in the longitudinal slot 34 of the file carriage. By having the file holder adjustable transversely of the frame in the manner described, a greater file surface is obtained while the angle of adjustment of the file holder may be varied at will.

The file-holding frame consists of a hori- Zontally-disposed bar 38 mounted for pivotal and horizontal movement in a pair of spaced perforated lugs 39 secured to or formed integral with the radial arm 31. Secured to the opposite ends of the bar 38, as 1 by set screws 40, is a pair of downwardly and forwardly-extending arms 41 provided with terminal sockets 42 in which are rotatably mounted reversible cylindrical blocks 'or bushings 43 and 44, the latter carrying the file 45, as shown. The bushings are secured in fixed position by set screws 46 and the bushing 43 is preferably provided with a series of peripheral graduations 47 adapted to register with an indicating mark on the adjacent socket 42 so that by rotating said bushing the file may be adjusted to cut the desired hook of the saw teeth. By having the bushing mounted in this manner the file may be reversed. in order to have the handle thereof in convenient position for use by the operator in filing the reverse side of the same, while by having the spaced arms 41 slidabl mounted. on the bar 38 said arms may be readily adjusted to accommodate files of different lengths. The arms 4]. are provided with coincident upwardly-extending lugs 48, and slidably mounted between said lugs is a vertically adjustable gage bar 49'101 determining or governing the depth of cut of the saw teeth. The opposite ends of the gage bar 49 are bent upwardly and slotted, as indicated at 50 for the reception of clamping screws 51 which serve to hold said bar in adjusted position. The downward movement of the bar 49 is limited by engagement with a terminal angular extension or stop 52 on the radiating arm 31, thereby insuring a uniform depth of cut of the saw teeth throughout the entire length of the saw.

In operation the saw is clamped between the bars 15 and the latter inserted between the rabbeted faces of the bar 5 and jaw 14, after which said jaw is adjusted. laterally by turning the screw 17 which securely clamps the saw in position to be filed. The file carriage is then shifted to one end of the frame and the file-holding frame rotated until the file assumes the proper angle or inclination with respect to the saw. After the carriage has been adjusted to give the proper fleam to the saw teeth, the file is adjusted in order to give the desired hook to said teeth by rotating the bushings after which the depth of cut is regulated by adjusting the gage bar, as

before stated. By depressing the spring pawl 24 the carriage may be moved longitudinally of the frame with a step-by-stcp movement to the position shown by dotted lines in Fig. 3 of the drawings, the file holder and filebeing reciprocated back and forth to effect the sharpening of the saw teeth, as will be readily understood. After the teeth on one side of the saw have been sharpened the spacing bar is shifted. longitudinally the distance of one notch and the saw, together with the file carriage reversed in order to sharpen the teeth on the opposite side of said saw. The reversal of the carriage causes thehandle of the file to extend over the bench IOU or support and in order to properly position said handle with respect to the operation a reversal of the file is also necessary, which latter is accomplished by changing the bushings. The several parts being now in the position shown inFig. 4 of the drawings, the teeth on the reverse side of the saw may be readily sharpened by operating the file carriage in the manner before stated.

Having thus described the invention, what is claimed is 1. In a saw filing machine, a supporting frame having laterally extending arms connected .by a longitudinally disposed rod, means carried by the frame for clamping a saw, a carriage mounted for travel on the frame and provided with depending perforated ears for the reception of the longitudinal connecting rod, a file holder mounted on the carriage, a toothed spacing bar seated in recesses in the laterally extending arms, and a pawl carried by the carriage and adapted to engage the teeth on the spacing bar thereby to gage the movement of said carriage.

2. In a filing machine a supporting frame, alongitudinally adjustable toothed spacing bar mounted on the frame and provided with a series of spaced terminal notches, spaced apart a distance equal to approximately one half the distance between the teeth on said spacing bar a pawl pivoted to one end of the supporting frame and adapted to engage the terminal notches in the bar for locking the latter in adjusted position, a carriage mounted for travel 011 the frame, a file holder rotatably mounted on the carriage, a saw clamping means, and a pawl carried by the carriage and adapted to engage the intermediate teeth on the spacing bar for gaging the movement of the carriage.

3. In a filing machine, a supporting frame, a saw clamping means, a carriage mounted for travel on said frame, a reciprocating file holder rotatably mounted on the carria e and provided with. a pair of spaced file supporting arms, a gage bar disposed between said arms and having its opposite ends bent upwardly into engagement with said arms and provided with terminal slots, screws secured to the file supporting arms,

and engaging the slots in the ends of thegage bar for locking the latter in adjusted position, and means carried by the carriage and engaging the file holder for clamping the latter in adjusted position.

ISAAC HOOD FARROW. Witnesses:

A. RIESENECKER, J. W. Woon. 

